Portal 2: Songs to Test By (Collector's Edition) is the best of Aperture Labs

On October 30, you can take home the complete soundtracks to Portal and Portal 2.

The physical set, called Portal 2: Songs to Test By (Collector's Edition), now includes a fourth CD with 13 tracks that features music from the original game. You can also listen to the two songs from Jonathan Coulton ("Still Alive" and "Want You Gone") and vocals by opera singer Ellen McLaine as GLaDOS. The collection also comes with a minicomic titled "Turret Lullaby."

Volume/Disc #2:
1. You Will Be Perfect
2. Halls of Science 4
3. (defun botsbuildbots () botsbuildbots ))
4. An Accent Beyond
5. Robot Ghost Story
6. Die Cut Laser Dance
7. Turret Redemption Line
8. Bring Your Daughter To Work Day
9. Almost At Fifty Percent
10. Don't Do It
11. I AM NOT A MORON!
12. Vitrification Order
13. Music of the Spheres
14. You are Not Part of the Control Group
15. Forwarding the Cause of Science
16. PotatOS Lament
17. The Reunion
18. Music of the Spheres 2 (Incendiary Lemons)